Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamHelperFunctions.cs
===================================================================
diff -u -r2089 -r3525
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamHelperFunctions.cs	(.../DamHelperFunctions.cs)	(revision 2089)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamHelperFunctions.cs	(.../DamHelperFunctions.cs)	(revision 3525)
@@ -91,20 +91,5 @@
             // assemble the target project file name
             return Path.Combine(stabilityWorkingPath, calculationName + ".sti");
         }
-
-        /// <summary>
-        /// Gets the D-GeoStability executable path.
-        /// </summary>
-        /// <value>
-        /// The m stab executable path.
-        /// </value>
-        public static string MStabExePath
-        {
-            get
-            {
-                return Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location),
-                    @"DGeoStability.exe");
-            }
-        }
     }
 }
Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Interface.pdb
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Version.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/nl-NL/Deltares.DamEngine.Interface.resources.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Data.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Io.pdb
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/nl-NL/Deltares.DamEngine.Data.resources.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/DGeoStability.exe
===================================================================
diff -u -r3028 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Calculators.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Interface.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/nl-NL/Deltares.DamEngine.Calculators.resources.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Io.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportDataException.cs
===================================================================
diff -u
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportDataException.cs	(revision 0)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportDataException.cs	(revision 3525)
@@ -0,0 +1,38 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of the application DAM - Clients Library.
+//
+// DAM - UI is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Runtime.Serialization;
+
+namespace Deltares.Dam.Data
+{
+
+    [Serializable]
+    public class CsvExportDataException : Exception
+    {
+        public static string ExceptionMessage { get; set; }
+
+        public CsvExportDataException(string message) : base(message)
+        {
+            ExceptionMessage = message;
+        }
+    }
+}
\ No newline at end of file
Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Version.pdb
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/DGSMStabDAM.dll
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Data.pdb
===================================================================
diff -u -r3456 -r3525
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Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Deltares.Dam.Data.csproj
===================================================================
diff -u -r3445 -r3525
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Deltares.Dam.Data.csproj	(.../Deltares.Dam.Data.csproj)	(revision 3445)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Deltares.Dam.Data.csproj	(.../Deltares.Dam.Data.csproj)	(revision 3525)
@@ -171,6 +171,7 @@
     <Compile Include="Assemblers\TimeSeriesAssembler.cs" />
     <Compile Include="BackgroundRepositoryFeature.cs" />
     <Compile Include="CalculationParameters.cs" />
+    <Compile Include="CsvExportDataException.cs" />
     <Compile Include="CsvExportSurfaceLineIdentifiers.cs" />
     <Compile Include="CsvImporters\CsvImporter.cs" />
     <Compile Include="CsvImporters\CsvImporterCharacteristicPoints.cs" />
@@ -408,10 +409,6 @@
     </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
-    <Content Include="..\..\..\lib\DamEngine\DGeoStability.exe">
-      <Link>DGeoStability.exe</Link>
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
     <Content Include="..\..\..\lib\DamEngine\DGSMStabDAM.dll">
       <Link>DGSMStabDAM.dll</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs
===================================================================
diff -u -r3459 -r3525
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs	(.../CsvExportData.cs)	(revision 3459)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvExportData.cs	(.../CsvExportData.cs)	(revision 3525)
@@ -207,7 +207,7 @@
             {
                 if (!String.IsNullOrEmpty(BaseFileName))
                 {
-                    const string fileExtension = ".sti";
+                    const string fileExtension = ".stix";
 
                     string fullBaseFilename = DamProject.ProjectWorkingPath;
                     if (CalculationSubDir != "")
@@ -1688,7 +1688,7 @@
                         break;
                     case FailureMechanismSystemType.Piping:
                         res = PipingFactor;
-                        break;                    
+                        break;
                 }
                 return res;
             }
@@ -1717,7 +1717,7 @@
                         break;
                 }
                 return res;
-            }            
+            }
         }
 
         [Format("F3")]
@@ -1799,7 +1799,7 @@
             {
                 if (damFailureMechanismeCalculationSpecification.FailureMechanismSystemType == FailureMechanismSystemType.Piping)
                 {
-                    return damFailureMechanismeCalculationSpecification.PipingModelType;                    
+                    return damFailureMechanismeCalculationSpecification.PipingModelType;
                 }
                 return null;
             }
@@ -2043,50 +2043,46 @@
         /// <param name="extension">The extension.</param>
         private void CopyResultFile(string extension)
         {
-            string copyResFile = Path.GetDirectoryName(InputFile) + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(InputFile) + " (copy)" + extension;
+            string copyResFile = Path.GetDirectoryName(InputFile) + Path.DirectorySeparatorChar +
+                                 Path.GetFileNameWithoutExtension(InputFile) + " (copy)" + extension;
             var resFile = Path.ChangeExtension(InputFile, extension);
             if (resFile != null)
             {
                 File.Copy(resFile, copyResFile, true);
             }
         }
 
-        private string GetCurrentExeForOpenCalculationFile()
-        {
-            return DamHelperFunctions.MStabExePath;
-        }
-
         /// <summary>
         /// Opens the calculation file.
         /// </summary>
         public void OpenCalculationFile()
         {
             if (File.Exists(InputFile))
             {
-                string copyFile = Path.GetDirectoryName(InputFile) + Path.DirectorySeparatorChar + 
-                    Path.GetFileNameWithoutExtension(InputFile) + " (copy)" + Path.GetExtension(InputFile);
+                string copyFile = Path.GetDirectoryName(InputFile) + Path.DirectorySeparatorChar +
+                                  Path.GetFileNameWithoutExtension(InputFile) + " (copy)" +
+                                  Path.GetExtension(InputFile);
                 File.Copy(InputFile, copyFile, true);
-                var exeName = GetCurrentExeForOpenCalculationFile();
 
-                const string stdExtension = ".std";
-                CopyResultFile(stdExtension);
-
-                const string stoExtension = ".sto";
-                CopyResultFile(stoExtension);
-                
                 var process = new Process
                 {
-                    StartInfo =
+                    StartInfo = new ProcessStartInfo(copyFile)
                     {
-                        RedirectStandardOutput = false,
-                        FileName = exeName
+                        UseShellExecute = true,
+                        WindowStyle = ProcessWindowStyle.Normal
                     }
                 };
-                
-                process.StartInfo.Arguments = " \"" + copyFile + "\"";
-                process.StartInfo.UseShellExecute = false;
-                process.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
-                process.Start();
+                try
+                {
+                    process.Start();
+                }
+                catch (Exception)
+                {
+                    var exceptionMessage = string.Format(
+                        "The file {0} could not be opened with D-Stability. Make sure files with the extension {1} are associated with D-Stability.",
+                        InputFile, Path.GetExtension(InputFile));
+                    throw new CsvExporterException(exceptionMessage);
+                }
             }
             else
             {
@@ -2109,7 +2105,9 @@
         public bool IsVisible(string property)
         {
             if (damFailureMechanismeCalculationSpecification == null)
+            {
                 return false;
+            }
             switch (property)
             {
                 case "StabilityModel":
@@ -2118,18 +2116,20 @@
                            damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
                            FailureMechanismSystemType.StabilityOutside;
                 case "PipingModel":
-                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType == FailureMechanismSystemType.Piping;
+                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
+                           FailureMechanismSystemType.Piping;
                 case "PipingFactor":
-                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType == FailureMechanismSystemType.Piping;
+                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
+                           FailureMechanismSystemType.Piping;
                 case "HCritical":
-                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType == FailureMechanismSystemType.Piping;
+                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType ==
+                           FailureMechanismSystemType.Piping;
                 case "OpenCalculationFile":
-                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType != FailureMechanismSystemType.Piping &&
-                           File.Exists(GetCurrentExeForOpenCalculationFile());
+                    return damFailureMechanismeCalculationSpecification.FailureMechanismSystemType !=
+                           FailureMechanismSystemType.Piping;
                 default:
                     return true;
             }
-
-        }        
+        }
     }
 }
\ No newline at end of file
Index: DamClients/DamUI/trunk/lib/DamEngine/Deltares.DamEngine.Calculators.pdb
===================================================================
diff -u -r3456 -r3525
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